Valve



L. H. STUART Oct. 16, l92.

VALVE Filed Aug. 28, 1926 2 Sheets-Sheet 1 j S11/wanton L. H. 1v/HRT,

Oct. 16, 1928. 1,688,299

L. H. STUART VALVE Filed Aug. 28, 1926 2 Sheets-Sheet 2 QQ ff. C5695 ,NTHKE COMPRESION Pf3 .11 11* m 9 Q 0 t y 9 Q @j f 1%9. 6. /Q. 7. POWER Exunuv Winn-st Patented Oct. 16, 1928.

UNITED STATES PATENT oIFicuA LUTTRELL H. STUART, 0F CHICAGO, ILLINOIS.

VALVE.

i Application filed August 28, 1926. Serial No. 132,244.

This invention relates to valves especially adapted for use on internal combustion en-y gines, although not necessarily restricted to such use.

Briefly stated, an important object of this invention is to provide novel means whereby the intake and exhaust of an engine cylinder is reliably controlled by a slide valve mecha-V nism in which the opening and closing of the portsis regulated by a cam or eccentric op erating from or olf the crank shaft or a special cam shaft.

Other objects and advantages will be aps parent during the course of the following description. i

In the accompanying drawings forming a part of this application and in which like numerals are employed to designate like parts throughout the same,

Figure 1 is a vertical section through the valve mechanism applied, omitting a valve operating lever;

Figure 2 is a side elevation of the improved valve mechanism applied, parts being in seccylinder within which the usual piston op-y crates, and, of course, the piston has connection with a crank shaft through the medium of a connecting rod, all of which is old andv well known.

In carrying out the invention one side or other portion of the cylinder is provided with a valve casing 6 within which a vertically slidable valve 7 is mounted. The valve 7 is provided with an intake port 8 and an eX- haust port 9, these two ports being at approximately the saine points on the slide valve.

The port 8 is adapted to communicate with an intake port 10 in the engine cylinder to permit of the supply ofa combustible fuel to the combustion chamber of the engine. It is obvious that a carburetor is connected to the valve casing 6 either directly or through the medium of a manifold and when the port 8 -is in registration with the port 1() on thel intake stroke of the piston combustible fuel is admitted to the combustion chamber. It will, therefore, be seen that the slide valve 7 is on its down stroke while the piston is partaking of its suction stroke, but the slide valve travels at only one-half the rate of travel of the piston as will be morey fully hereinafter described,

When the valve 7 reaches the limit of its upward movement, the port 9 therein, will register with the exhaust port 11 in the cylin der whereby to allow of the escape of the product of combustion.

The slide valve 7 is operated by a rod or stein 14, the lower portion of which has con nection with a crank 15 through the medium of a link 16, this feature of the invention being fully illustrated in Figure 1. Vith reference to this'fl'gure, it will be seen that the crankl is operated at one half engine speed byy reason of the ratio of the timing gears so that on the initial turning of the main crank shaft in a clockwise direction the ports 8 and 10'will`be brought into registration for adn mitting a charge of combustible fuel. However, the continued downward movement of the slide valve 7 will cause the port 8 to move 4travel while the piston is still on its compression stroke, during which timel all valves are closed. Further upward movement ofthe valve 1s caused by the continued turning of 'the crank 15 and the piston will partake. of

its power stroke while the valve is moving upwardly. t

It may be pointed out at this time that during the upward movement of thejvalve on the power stroke of the piston, the ports 8 and 10 will be brought into registration for a limited period, butno communication is established between the carburetor and the combustion chamber due to a supplemental valve` `the structure and operation of which will be described.

When the slide valve reaches the limit of its upward movement, subsequent, of course, to the power stroke, the exhaust ports 9 and 11 will be brought into registration to allow of the escape of the products of combustion on the exhaust stroke.

The registration of the exhaust ports 9 and 11 completes one cycle of operation of llll are in registration.

Coming now to the description of the sapplementalvalve for controlling the intake on the upward movement of the main valve 7,

attention'is directed to Figure 2 whichV illus-` trates that the supplemental valve 2O moves across the port 8 andk has a stern 2l to which a crank or operating lever 22 is pivotedr The crank 22 has its major portion bowed t-o-de-v line what might be said to be a pair of cams 22a, 22b at opposite sides vof the fulcrum 24.

The cams surfaces 22a, 22b at opposite sides of the fulcrum 24 are directlyin the path of travel and are adapted to be engaged by the pin or actuating member 80 on the stem 14 of the main valve. INhen the actuating member 3.0 approaches'the lirnit of its descent on the compression stroke of the piston, it will engage the lower cam portion 22b of the crank 22 and will thereby move the valve 20 to a closed position so that on the subsequent .ower stroke, no. communication will be established between the carburetor and the combustion chamber. Suola communication would, of course, be fatal to the successful operation of the engine.

Now, when the actuating member 30 approaches the limit of its upward movement will engage the upper cam surface 22L of the crank 22 s o that the supplemental valve 20 is moved to its retracted or what might be said to be its opened position. Of course, the movement of the valve 20. to.y itsretracted or opened position is not productive of immediate results, but merely allows of the communication of the carburetor with the combustion chamber when the ports 8 and 10 are subsequently brought into registration on the intake stroke of; the piston.

In carrying out. the invention suitable packings may be employed for the different valves and of course means may be provided to carry off the products of combustion in case the engine is used in an automobile.

Having thus. described the invention, what is claimed is: y

1. A valve for engines comprising La casinghaving intake and exhaust ports, a slide valve having intake and exhaust ports arranged side by side and adapted for registra tion with said first named ports, one of the ports in said casing being in advance of the other, and. asupplemental valve controlling the flow of fuel through said intake ports.

2. The combination with a cylinder having i `intake and exhaust ports, of a valve slidable across said ports and having a stemprovided 'with a lug, and a supplemental valve controlling one of said ports and having an operating lever fulcrumed between the ends in the path of travel of and adapted to be' engaged by said lug whereby the operation of said stem actuates said leveil and the supplemental valve connected thereto.

'3. Thecombination with a cylinder having intake and exhaust ports, a valve slidable across said ports and provided with intake and exhaust ports adapted for communicationwith saidV first named ports, a stem connected to said valve and provided with a lug, a supplemental valve associated with said intake ports and having an operatingy lever, a portion ofy which is bowed to deiine cam surfacesvsaid cam surfaces being located at opposite sides of` said lug and adapted to be engaged thereby to operate said supplemental valve. 1

Il. The combination with a cylinder having intake and exhaust ports, a valve slidable across said ports and provided with intake and exhaust ports adapted for communication with said first namedk ports, a stem connected to said valve and provided with a lug, a supplemental valve associated with said intake ports and having an operating lever, a portion of which is bowed to define cam surfaces, said cam surfaces being located at opposite sides of said lug and adapted to be engaged thereby to operate said supplemental valve, said lever being fulcrumed between said cam surfaces.

5. A valve for engines comprising a casing Yhaving intake and exhaustl ports, a slide valve movable to periodically open and close said ports, a second slide valve in said casing for said casing, a slide valve for controlling said ports, a second slide valve carried by said 'closure and movable substantially transversely of said first slide vvalve to cooperate with the same in controlling said ports, cam means associated with said casing and connected to one of said valves, actuating means for the other valve, and cam actuating means carried by the latter valve.

In testimony whereof I affix my signature.

LUTTRELL H. STUART. 

